Molding machine



June 22 1926. l 1,589,555

J. T. RAMSDEN MOLDING MACHINE Filedsept. 23.l 1925 @ff/@ my? 7555,64.

Patented June 22, 1926.

UNITED STATES FFENTGFHCE. Y

JOHNT. RAMSDEN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO TEE TABOR MANUFACTURING COMPANY, 0F HLADELPHXA.. ENNSYLVANXA., A CORPORA- TIQN OF PENNSYLVANIA,

Moraine MACHINE.

Application filed september 23,1925. serial No. saam.

The principal object of the present inn vention is to improve and simplify the construction and operation of sliockless 'ja rollover molding machines, and to pro for turning the rol-lover arms on a fixed fuA crurn or center whileinsuring proper ramming and whilef permitting proper clearrollover fulcrum or anis, i. e. the jarring table to work from the high level when jar ring and from the low level when the arms are turned. 'j

The invention further consists in lthe improvements to be presently described and finally claimed.

InA the following description reference will be made to the accomganying drawing in which is illustrated one embodiment se'- r lected from other embodiments of the invention for the sake of description and in that drawing,

i Figure 1 is a. view, partly in section and partly' in elevation, of so much and of such parts as are necessary for an explanation of the invention, and

Fig. 2 is a diagrammatic top or plan view drawn to a reduced scale.

In the I.drawing the rollover arms 1 are turnable about a fixed fulcrum or center 2 shown as a provision of a pedestal or frame 3. 1l' is a rollover plate. 5 are dowel pins for positioning the rollover plate fl with ref spect to the jarring` table 6. The jarring table 6 is compelled to jar from'a high level and to permit the arms l to turn from a low level as shown in 1, and the low level is co-ordinated with the position of the fixed fulcrum 2 to permit the dowel pins 5 to clear when the arms 1 are turned over. 7 is the anvil and 8 is the anvil guide of a typical shockless jarring machine in which the plunger 9, cylinder 10 and their fluid connections 17 operate to raise .and lower the jarring table in respect to the anvil. 10a may be regarded as the usual springs interposed between the anvil and the base of its guide and their function is to lift the anvil in such a Way that the collision between it tion.

i ways.

and the descending jarring tableV and flask occurs when both the jarring table and anvil are traveling in `the air above the founda- The elements 11 and 12 constitutea fluid piston and cylinder arranged under the anvil and adapted to lift it the jarring table from the level shown in Fig. l to a higher level, higher in the present instance by the distance shown between the surfaces 13 and 11i.- 15 is a fluid connection for operating the piston and cylinder 11 and 12; 16 is a spring under the element 11, which may be regarded as the abutment element and its purpose is to balance at least a: part of the `Vweight of the superstructure during jarring so as to avoid the communication of shocks `to the foundation, The fluid connections` 15 and 17 Vare designed, constructed and' arranged in such a way that the anvil-1 and jarring table are raised to thev high level before jarring commences. This can of course be accomplished in a variety of obvious As shown these connections v and 17 are branches of a supply pipe 18 controlled by a valve 19, but the connections t5 and 17 are so proportioned that the anvil is lifted to the high level before the jarring starts. v, v

An explanation of the invention can be i* facilitated by af briefy description. of one way of operating the molding machine to which the invention is applied. Aflaslr With a .stripping plate and a pattern plate are mounted on and. properly connected Sand putinto` theilask and jar rammed.

with the-rollover plate.

Afterward the arms are turned over toward the left in 1 and the flask deposited upon a support,

not shown because too well understood, andV the flask and stripping plate are lifted from the pattern plate by any .suitable means, not shown because too well understood to require illustration. Of course if preferred the flask can be dropped or lowered in order to draw the pattern and in that case the stripping plate may be dispensed with.

The mode of operation of the present invention may be described as follows:

The flask with its pattern equipment and sand is placed on the rollover plate 4 in the low position thereof sho-wn in Fig. 1. Fluid under pressure is admitted as by opening the valve 19. The resultof this is that liuid under pressure entering the space 20 lifts CFI the anvil 7 and with it the jarring table 6 and rollover plate and mold and its accessories to the high level position. rPhe spring 16 is of sutlieient strength to permit this to occur without material compression. Another result ot the admission of Huid under pressure is that a'lter the jarring table and parts carried therewith have been lifted to the higher level as described the arring action occurs and the operation is shockless for the reasons set -l'orth. Upon co-mpletion of the ar ramming of the mold the fluid pressure connections are evacuated or eX- hausted with the result. that the parts return to the position shown in Fig. 1, The arms 1 are rolled over in any appropriate way by power or otherwise and as the arms 1 start to roll over the dowel pins 5 are cleared because the fixed aXis 2 and the level of the jarring table are properly co-ordinated to accomplish that result.

It will of course be understood that when the arms 1 are rolled over the rollover plate is secured to them and that when the flask is jar rammed the arms and rollover plate are disconnected. Those skilled in the art know without further explanation the construction and operation ot locking mechanism usually employed for those purposes.

During the jar ramming operation the rollover arms 1 occupy a position determined by the location ot the fixed fulcrum or center 2, and by a limit stop shown as a provision of the pedestal or iframe, and that predetermined position ot the arms is appropriate not only for providing proper draft for the dovvel pins when the rollover table is lifted vertically or is rolled over but also for permitting proper operation of the locking and unlocking of the mechanism by which the arms and rollover table are connected and disconnected when the rollover table is on the jarring table.

It will be obvious to those skilled in the art to which the invention relates that modilications may be made in details ofconstruction, arrangement and matt-ers et mere form without departing from the spirit ot the invent-ion which is not limited in respect to such things or otherwise than the prior art and the appended claims may require.

I claim:

1. A molding machine having rollover arms, a lixed tulcrum or center about which the rollover arms are turnable, a rollover plate, dowel pin connection for the rollover plate, a jarring table compelled to jar trom a high level and to permit thel arms to turn from a low level co-ordinated with the position of the fulcrum to permit the dowel pins to clear, an anvil and anvil guides, a jarring piston and cylinder interposed between the anvil and jarring table, a fluid piston and cylinder provided between the anvil and anvil guide for lifting the anvil and with it the jarring table to the high level, and means for compelling the last named piston and cylinder to litt betere jarring starts.

2. A molding machine having rollover arms, a fixed tulcrum or center about which the rollover arms are turnable, a rollover plate, dowel pin connection for the rollover plate, a jarring table compelled to jar from a high level and to permit the arms to turn from a low level co-ordinated with the position of the tulcrnm to permit thc doivel pins to clear, an anvil and anvil guides, a jarring piston and cylinder interposed between the anvil and jarring table, a tluid piston and cylinder provided between the anvil and anvil guide for litting the anvil and with it the jarring table to the high level, means for compelling the last named piston and cylinder to litt before jarring starts, and a spring co-operating with the abutment element ot the last named piston and cylinder to balance Weight et' the anvil.

3. A molding machine havingr rollover arms, a fixed ulcrum or center about which the rollover arms are turnable, a rollover plate, vdowel pin connection for the rollover plate, a jarring table compelled to jar from a high level and to permit the arms to turn from a low level co-ordinated with the position ot the ulcrum to permit the dowel pins to clear, and means for lifting the jarring table to the high level betere arring starts.

JOHN T. RAMSDEN. 

